Scuppernongs are a grape similiar to Muscadines but are not indiginous to my area so I cant help you to much in that area but Im sure someone can and if not pm me as I do know a few people on another forum who can help you with that endeavor. Blackberries I have experience with as do many others on this forum so feel free to pick our minds. Glad to have you here.
Welcome aboard. Scuppernongs are a Muscadine variety. Muscadines have quite a few cultivers. For those that don't know, Muscadines are a grape variety that is in a different species (Vitis rotundifolia) than the normal European wine grapes (Vitis vinifera). They do not grow in clusters like European cultivers. Look for just about any Muscadine recipe and that will work just fine for you. Make sure you have an acid test kit. They are a very acidic grape.
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